Abstract
Successful enantiomeric separation of 10 chiral pesticides by high-performance liquid chromatography (HPLC) using cellulose-tris(3,5-dimethylphenylcarbamate) (CDMPC) chiral stationary phase (CSP) was performed. The mobile phase was n-hexane modified by ethanol, propanol, 2-propanol (IPA), butanol, or isobutanol. The effects of mobile phase composition and column temperature on the separation were investigated. Baseline separation was obtained with ethofumesate, fluroxypyr-meptyl, malathion, benalaxyl, diclofop-methyl, methamidophos, vinclozolin, and lactofen, whereas near baseline separation was obtained with profenofos and acetochlor. Butanol was the best modifier for benalaxyl; isobutanol was the best modifier for lactofen, malathion, diclofop-methyl, and ethofumesate; and IPA was the best modifier for the other five. Better separations were not always at low temperature. The elution orders of the eluting enantiomers were determined by a circular dichroism (CD) detector. The quantitative analysis methods for the enantiomers of ethofumesate, benalaxyl, and diclofop-methyl were established. Validation parameters include linearity, precision, and limit of detection (LOD). The enantiomeric residual analysis procedures in soil and...Continue Reading
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